Pls help me giving out points for the correct answer and

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

What is the solution to the equation below? 3/x-2+6=square root x-2 +8